third eyelid   (TTS Sound)

The third_eyelid has 1 Senses.

• nictitating membrane, third eyelid
• 瞬膜
• a protective fold of skin in the eyes of reptiles and birds and some mammals
• 爬虫類、鳥類、ある種のほ乳類の眼の皮膚の保護ひだ